The Tor Browser / file revision

 // Frame.prototype.this in strict-mode functions, with primitive values

 var g = newGlobal();

 var dbg = new Debugger(g);

 var hits = 0;

 dbg.onDebuggerStatement = function (frame) {

     hits++;

     assertEq(frame.this, g.v);

 };

 g.eval("function f() { 'use strict'; debugger; }");

 g.eval("Boolean.prototype.f = f; v = true; v.f();");

 g.eval("f.call(v);");

 g.eval("Number.prototype.f = f; v = 3.14; v.f();");

 g.eval("f.call(v);");

 g.eval("String.prototype.f = f; v = 'hello'; v.f();");

 g.eval("f.call(v);");

 g.eval("v = undefined; f.call(v);");

 g.eval("v = null; f.call(v);");

 assertEq(hits, 8);